# Puro.earth, Isometric or Verra: which suits a biochar project?

Canonical: https://senseible.earth/answers/puro-vs-isometric-vs-verra-biochar

All three take biochar projects from India. Isometric's Biochar Protocol v1.0 and Verra's VM0044 v1.2 were approved for the ICVCM CCP label in August 2025; Puro.earth, which wrote the first biochar methodology, is a CCP-Eligible programme. Pick by which buyers you are selling to, how your kilns run and how often you need issuance.

## Puro.earth

- Credit: the CORC, one tonne of durable net removal, issued after verification.
- Methodology: Puro Biochar, Edition 2025, version 2. Biochar is labelled 200+ years.
- Audits: a facility audit by an independent VVB, valid up to five years, then an output audit per reporting period. Puro.earth pays the auditors.
- Credits are sold to buyers directly, through marketplaces or through brokers.

## Isometric

- Credit: one certificate per tonne, issued per production batch on a public registry with the data behind it.
- Protocol: Biochar Production and Storage, whose v1.0 is CCP-approved. Modules cover industrial plants, distributed production, mobile reactors and combustion co-products.
- Durability: soil storage credited at 200 years, or 1,000 years with extra testing.
- Steps: eligibility check, 10-day public comment, validation with a site visit, batch verification, issuance. Isometric picks the verifier, and buyers pay for certification, not project developers.

## Verra VM0044 v1.2

- Credit: VCUs on the Verra Registry, where anyone can open an account.
- CCP-approved since August 2025. Additionality now includes an investment analysis under VT0008.
- Registration follows Verra's pipeline listing, 30-day public comment, validation and verification, then the issuance levy.

## How to choose

- Selling to a buyer who names a registry: use that one.
- Many small kilns across villages: check Isometric's distributed production module and how each registry treats open kilns.
- Need frequent cash: Isometric issues per batch; Puro offers on-demand issuance through Puro Issuance Plus for eligible industrial suppliers.
- Want the CCP label now: Isometric v1.0 and VM0044 v1.2 were approved on 13 August 2025. Check ICVCM's assessment status for later decisions on Puro's methodology.

## What Senseible does here

Senseible records each batch the same way whichever registry you pick: kiln sensor temperature logs, chain of custody, geotagged photos and H:Corg results, with automatic flags, in one verifier evidence pack. The chosen registry and its verifier make the call.

- [Carbon removal projects](https://senseible.earth/carbon-removal/projects)
- [What a CORC is](https://senseible.earth/answers/what-is-a-corc-puro-earth)
- [The Isometric registry](https://senseible.earth/answers/isometric-registry-explained)
- [VM0044 v1.2 investment analysis](https://senseible.earth/answers/vm0044-v1-2-investment-analysis-additionality)
- [Carbon credit platforms](https://senseible.earth/carbon-credit-platforms)

Sources: [Puro.earth, Certification: certification journey from initial qualification to CORC issuance](https://puro.earth/cdr-infrastructure/carbon-credit-certification/), [Isometric, Biochar pathway: Biochar Protocol v1.0, modules and five certification steps](https://isometric.com/pathways/biochar), [Verra, VM0044 Biochar Utilization in Soil and Non-Soil Applications, v1.2 (active since 27 June 2025), methodology page](https://verra.org/methodologies/vm0044-biochar-utilization-in-soil-and-non-soil-applications-v1-2/), [ICVCM, Integrity Council approves Biochar and Improved Forest Management methodologies (13 August 2025)](https://icvcm.org/integrity-council-approves-biochar-amp-improved-forest-management-methodologies/), [Verra, Registration and Issuance Process, v5.0 (16 December 2025)](https://verra.org/documents/registration-and-issuance-process-v5-0/)

Last reviewed 2026-11-02.